If you are receiving Social Security Disability and reach full retirement age, the full amount of your benefits will be transferred from SSDI to Social Security Retirement.
If you are receiving Supplemental Security Income and are over the age of 62, you may be able to receive Social Security Retirement benefits in addition to your SSI if you have worked and paid into Social Security long enough to be eligible.
If you are receiving SSI and are approaching retirement age, it is always a good idea to contact a qualified Social Security lawyer to review your options.